Originally Posted by
AirCanada881
Well all these data points are definitely interesting since they are contrary to what I've been told I will let you know once I book my tickets in a months time.
Just quoting myself here to update everyone, I can confirm you need an issued ticket number to look for upgrades, so I booked on Expedia CDG-IST-DPS/SGN-IST-CDG, all upgrades went through but the agent was abit slow which was annoying...
I'm afraid I won't be much help for availability, in every case, inventory showed C4 D4 Z4 J4 I4 R4... So a pretty straightforward case.